High speed grinding method, parameters and application of bearing raceway considering surface integrity

Abstract

The application belongs to the technical field of high-end bearing manufacturing, and discloses a bearing raceway high-speed grinding method, parameters and application considering surface integrity, adopts a grinding wheel linear velocity of 40 m / s to 80 m / s, and makes the bearing raceway linear velocity match the grinding wheel speed; the ratio of the bearing raceway linear velocity to the grinding wheel speed is represented by Ratio, that is, the value (effective value) of Ratio is 30 to 45, and the grinding depth a p is determined; includes a group of raceway surface integrity key indicators affecting bearing working performance or service life, an acceptable surface integrity key indicator definition method, and a high-speed grinding process and comprehensive coordinated design method of process parameters considering the raceway surface integrity key indicators of the bearing. The application adopts a high and stable grinding wheel linear velocity, a workpiece linear velocity v w matching the grinding wheel linear velocity, a reasonable grinding depth a p , and the maximum undeformed chip thickness generated thereby, effectively improves the raceway surface integrity key indicators of the bearing, and improves the long-term stability and service life of the bearing in actual operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-end bearing manufacturing, and particularly relates to a bearing raceway high-speed grinding method, parameters and application considering surface integrity. BACKGROUND

[0002] In the bearing manufacturing process, bearing raceway grinding is one of the most critical processes, and the grinding precision, especially the surface integrity key indicators, will directly affect the performance and fatigue life of the bearing. In the traditional bearing manufacturing field, the process and equipment adopted for bearing processing, including bearing raceway processing technology, process parameters and special grinding machine, mainly depend on the experience of engineers and the accuracy of machine tools, mainly investigate the size accuracy and rotation accuracy of the bearing, lack of evaluation of the surface integrity indicators of the bearing raceway, and lack of scientific evaluation system of the surface integrity indicators; the existing bearing raceway grinding is a special machine tool driven by a belt pulley and a gearbox, and the maximum working line speed of the grinding wheel is mostly 40 m / s, and the grinding test with a grinding wheel line speed higher than 50 m / s cannot be carried out; when the grinding wheel line speed exceeds 50 m / s, the system stability of the existing bearing raceway grinding machine is very poor. Therefore, it is necessary to study and adopt high-speed grinding process, to master the comprehensive coordination design method of high-speed grinding process parameters, to build the equipment capacity of key processes of rolling bearings, and to apply them to the key processes of bearing manufacturing, so as to realize the good working performance of high-grade bearings and improve the service life of bearings.

[0003] Through the above analysis, the problems and defects of the prior art are that the grinding test with a grinding wheel line speed higher than 50 m / s cannot be carried out, the scientific and usable high-speed grinding process parameters cannot be mastered, and the service life of the bearing cannot be improved through the existing mechanical processing technology. SUMMARY

[0004] In view of the problems existing in the prior art, the application provides a bearing raceway high-speed grinding method, parameters and application considering surface integrity.

[0005] The application is realized in the following manner: a bearing raceway high-speed grinding method considering surface integrity, the grinding wheel line speed used in the bearing raceway high-speed grinding method considering surface integrity is not less than 50 m / s, such as 50, 60, 70 and 80 m / s in the test, and the grinding wheel line speed used is matched with the bearing raceway line speed; the ratio of the grinding wheel line speed to the bearing raceway line speed is represented by Ratio, and the grinding depth a p .

[0006] Further, the bearing raceway line speed v w should be matched with the grinding wheel speed v s , v s and v wThe ratio is shown in the formula and is expressed as Ratio.

[0007]

[0008] The effective value of Ratio is 30 to 45.

[0009] Furthermore, with the goal of controlling key indicators of surface integrity, the maximum undeformed thickness 'a' of the wear debris is used. gmax To unify the variables, we examine different values ​​of a. gmax The achievement of key indicators of surface integrity in grinding under different combinations of process parameters was investigated and evaluated. gmax To investigate the interaction patterns of key surface integrity indicators, and to construct a correlation between key surface integrity indicators and a gmax A correlation model of process parameters and their combinations.

[0010] Furthermore, the maximum undeformed thickness a of the wear debris gmax The characteristic is that a gmax It is an important evaluation index derived from the combination of multiple process parameters, relatively independent, and used for quantitative analysis and prediction of key indicators of grinding surface integrity.

[0011] Another object of the present invention is to provide high-speed grinding process parameters for bearing raceways that take into account surface integrity, wherein the high-speed grinding process parameters for bearing raceways are v s This refers to the grinding linear velocity v corresponding to the inner ring raceway of the bearing at grinding wheel linear velocities of 50, 60, 70, and 80 m / s. w and grinding depth a p To investigate the bearing raceway linear velocity v that should be matched under different grinding wheel linear velocity conditions. w And the grinding depth a under certain ratio conditions of grinding wheel linear velocity and bearing raceway linear velocity. p And surface integrity indicators.

[0012] Another objective of this invention is to provide a method for defining key indicators of raceway surface integrity that affect bearing performance, as well as acceptable key indicators of surface integrity, including acceptable surface microstructure patterns, acceptable grinding-modified layer thickness, acceptable surface microcrack size, and acceptable key indicators of surface residual stress and their scales, and requires definition criteria and methods; the main measurement indicators of surface microstructure include grain size, grain orientation, and the consistency of grain size and grain orientation.

[0013] Furthermore, the surface microcrack measurement indicators include the width B, length L, and angle α between the surface microcrack and the circumferential direction of the raceway.

[0014] Key indicators of surface residual stress include the residual compressive stress σ on the surface and subsurface of the bearing raceway. c The subsurface layer, located far from the surface of the bearing raceway, exhibits residual tensile stress σ. t Depth d of residual compressive stress c Residual tensile stress depth value d t , as well as the limiting criteria and limit values ​​of key indicators of surface residual stress;

[0015] The consistency of grain size and grain orientation is one of the main indicators of surface microstructure. The grain size should meet the requirements, and the grain shape, size and orientation should be relatively consistent.

[0016] Furthermore, the grinding modified layer depth t 变质层 (x) should be less than or equal to the material removal thickness of the subsequent ultra-precision machining process, generally 2-3 μm, which is an acceptable grinding-modified layer; the depth of the modified layer t(x) depends on the bearing inner ring diameter d, the bearing inner ring wall thickness h, and the bearing working accuracy a. w The requirements for wear resistance (w) and other properties are also limited accordingly. That is, based on the actual application requirements, the limiting criteria or limit values ​​(T) are specified. 变质层 As shown in formula (1);

[0017] t 变质层 (x)=f(d,h,a w ,w,……)≤T 变质层 (1).

[0018] Furthermore, the surface microcrack measurement indicators include the microcrack width B and length L, the angle between the microcrack and the circumferential tangential direction is α, and B, L, and α should be as small as possible or approach 0. According to the actual application requirements, the limiting criteria or limit values ​​are determined, as shown in formula (2); among them, B, L, and α should be as small as possible or approach 0. When the microcrack width or length is greater than 10 μm, surface defects such as surface peeling or scratches will be formed.

[0019] t(x) 微裂纹 = f(B, L, α) ≤ T 微裂纹 (2).

[0020] Furthermore, the limiting criteria and limit values ​​for key indicators of surface residual stress should be specified, including the maximum residual compressive stress σ. cmax Maximum residual tensile stress σ tmax The extreme ratio ε of residual compressive stress to residual tensile stress σ The extreme value of residual stress on the machined surface as a percentage of the dimensional tolerance T is σ| t-c| , and their limiting values, as shown in formulas (3), (4), and (5);

[0021] σ |t-c| =σtmax -σ cmax (3)

[0022]

[0023] σ |t-c| ≤10%~15%T (5)。

[0024] Further, the acceptable surface integrity key indicator defining method includes acceptable grinding metamorphic layer thickness, acceptable surface micro-crack size, and acceptable surface residual stress key indicators, and specific defining criteria and methods conforming to objective conditions;

[0025] The grinding metamorphic layer thickness d is less than the material removal thickness of the subsequent superfinishing process, and is about 3 μm;

[0026] The width B, length L and the included angle α with the raceway circumferential direction of the surface micro-crack are less than or equal to 0, and are parallel to the raceway circumferential direction;

[0027] The surface residual stress depth dc should be greater than the residual tensile stress depth dt, and the ratio ε of the two is d Should meet the relationship of formula (6):

[0028]

[0029] The ratio ε of the absolute value of the maximum residual compressive stress σ cmax and the maximum residual tensile stress σ tmax Should meet the relationship of formula (7): σ

[0030]

[0031] Another object of the present application is to provide a high-end bearing raceway machining method using the bearing raceway high-speed grinding method considering surface integrity.

[0032] In combination with the above technical solutions and solved technical problems, the technical solution to be protected by the present application has the following advantages and positive effects:

[0033] ​First, the application includes a set of key indicators of raceway surface integrity that must be considered to affect the working performance or service life of bearings, an acceptable surface integrity key indicator definition method, and a high-speed grinding process and its process parameter comprehensive coordination design method considering the key indicators of bearing raceway surface integrity. Among them, the key indicators of raceway surface integrity affecting the working performance of bearings mainly include the modified layer and its depth of the bearing raceway surface, residual stress and its related indicators, surface texture, etc.; an acceptable surface integrity key indicator definition method refers to the limiting requirements and values of the surface integrity key indicators and their limiting values according to the bearing grade or service life target, such as the limiting requirements and values of the maximum and minimum residual tensile stress and compressive stress, the range and its distribution law, etc.; the design method of high-speed grinding process and its multi-process parameter comprehensive optimization considering the key indicators of bearing raceway surface integrity is to adopt high and stable wheel line speed, reasonable maximum undeformed chip thickness, and multi-process parameter comprehensive coordination design method. The application adopts high and stable wheel line speed, reasonable maximum undeformed chip thickness, and multi-process parameter comprehensive coordination design method.

[0034] Second, the application can effectively improve the key indicators of surface integrity of bearing raceway, overcome the difficulties such as difficult evaluation of rolling bearing raceway surface integrity indicators and reasonable optimization design and practice of grinding process parameters according to the target requirements of surface integrity indicators, and lay a reasonable and effective mechanical processing method, process parameters, and application test work basis for improving the service performance and fatigue life of high-end bearing products. Through effectively improving the key indicators of surface integrity of bearing raceway, the application can improve the long-term stability and service life of bearings in actual operation, and narrow the gap with imported high-end bearings.

[0035] Third, the creativity of the application as claimed is also reflected in the following important aspects:

[0036] (1) The technical solution of the application fills the technical gap in the industry at home and abroad:

[0037] The high-speed grinding process and technology of the inner ring raceway of the bearing effectively improve the key indicators of surface integrity of the raceway surface, and the actual test life of the high-end bearing is increased by 50-100%.

[0038] Related explanation: The reason for the large range of actual test life is that there are many part processing and assembly processes of bearings, and any change in process conditions such as the stability of automatic feeding and discharging mechanism, grinding wheel wear, etc. caused by inconsistency and instability of production environment, processing errors of related parts of bearings, etc.

[0039] (2) The expected income and commercial value of the transformed technical solution of the application are:

[0040] Taking the test bearing model 7002P4 for fatigue life test as an example, the price of the domestic human bearing is 61 yuan, and the price of the Japanese NSK bearing is 231 yuan, and the price difference of one bearing is 170 yuan.

[0041] In summary, after formal production, according to 1 million sets of bearings per year, 170 million yuan can be increased.

[0042] (3) The technical scheme of the present application solves the technical problems that people have been eager to solve but have failed to succeed:

[0043] Compared with foreign brand bearings, the actual test life of high-grade bearings traditionally manufactured in China is generally increased by 50-100%!

[0044] (4) The technical scheme of the present application overcomes technical bias: the present application is a breakthrough in the field of new process methods and engineering application technologies, breaking traditional concepts and existing process technologies and methods. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a bearing raceway high-speed grinding method flowchart considering surface integrity provided by the embodiment of the present application;

[0046] Figure 2 is a main method and its relationship with key indicators provided by the embodiment of the present application;

[0047] Figure 3 is a modified layer grinding schematic diagram provided by the embodiment of the present application;

[0048] Figure 4 is a raceway surface micro-crack schematic diagram provided by the embodiment of the present application;

[0049] Figure 5 is a raceway residual stress and its important indicator schematic diagram provided by the embodiment of the present application;

[0050] Figure 6 is a schematic diagram of the grinding wheel linear velocity for reducing the proportion of surface micro-cracks provided by the embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0052] As shown in Figure 1 The bearing raceway high-speed grinding method considering surface integrity provided by the embodiment of the present application includes the following steps:

[0053] S101: the linear speed of the grinding wheel adopted is not less than 50 m / s, and the linear speed of the bearing raceway is matched with the speed of the grinding wheel;

[0054] S102: the ratio of the linear speed of the bearing raceway to the speed of the grinding wheel is denoted as Ratio, and the value of Ratio is 30-45; at the same time, the grinding depth a is determined p ;

[0055] Embodiment 1:

[0056] The high-speed grinding method considering the key indicator of the surface integrity of the bearing raceway provided by the embodiment of the application adopts the linear speed v s of the grinding wheel not less than 60 m / s, and the linear speed v w of the bearing raceway is matched with the speed v s of the grinding wheel, the ratio of v s to v w is shown in the formula, denoted as Ratio, the value (effective value) of Ratio is 30-45, and at the same time, the grinding depth a p needs to be reasonably determined ;

[0057]

[0058] The value (effective value) of Ratio is 30-45.

[0059] In the embodiment of the application, the linear speed v s of the grinding wheel is not less than 60 m / s, the linear speed v w of the workpiece is matched with the linear speed of the grinding wheel, and the reasonable grinding depth a p is determined, and the embodiment is characterized in that, the key indicator of the surface integrity is taken as the target, the maximum undeformed thickness a gmax of the grinding chip is taken as the unified variable, the traditional a gmax calculation formula is taken as the basis, the grinding experiment of the multiple process parameters and the uncertain correlation coefficient are planned, the compliance of the key indicator of the grinding surface integrity under the conditions of different a gmax and different process parameter combinations is investigated, the role of a gmax on the key indicator of the surface integrity is investigated and evaluated, the correlation model of the key indicator of the surface integrity and a gmax , the process parameters and the combination thereof is constructed, and the optimization design of the high-speed grinding process parameters of the bearing raceway aiming at improving the working life of the bearing is realized.

[0060] In the embodiment of the application, the maximum undeformed thickness a gmax of the grinding chip is characterized in that a gmax is an important evaluation indicator which is derived from the combination of multiple process parameters, is relatively independent, and can quantitatively analyze and predict the key indicator of the grinding surface integrity, and a is effectively determinedgmax The traditional calculation formula of a gmax is related to the combination condition of the traditional calculation formula and the actual process parameters of a gmax , and the accurate value of a c is related to some undetermined indexes and coefficients in the traditional calculation formula of a t .

[0061] Embodiment 2:

[0062] The key indicators of the raceway surface integrity affecting the working performance of the bearing provided by the embodiments of the present application include surface microstructure, ground surface modified layer, surface microcrack and surface residual stress.

[0063] The method for defining the acceptable key indicators of surface integrity provided by the embodiments of the present application includes acceptable surface microstructure mode, acceptable ground surface modified layer thickness, acceptable surface microcrack size, and acceptable surface residual stress key indicators and their scales, and needs to meet specific definition criteria and methods.

[0064] In the embodiments of the present application, the main measurement indicators of the surface microstructure include grain size, grain orientation, and the consistency of grain size and grain orientation.

[0065] In the embodiments of the present application, the ground surface modified layer is caused by temper softening and material modification due to excessive temperature rise of the material during the raceway grinding process, and the surface appears a lower hardness and looser structure, which presents obvious dark purple after 10% nitric acid etching treatment, and the thickness of the ground surface modified layer should be restricted or controlled.

[0066] In the embodiments of the present application, the measurement indicators of the surface microcrack include the width (B), length (L) and included angle (α) with the circumferential direction of the raceway of the surface microcrack.

[0067] In the embodiments of the present application, the key indicators of the surface residual stress include the residual compressive stress (σ c ) of the surface layer and subsurface layer of the bearing raceway, the residual tensile stress (σ t ) of the subsurface layer far away from the surface layer of the bearing raceway, the depth (d c ) of the residual compressive stress, the depth value (d t ) of the residual tensile stress, and the definition criteria and limit values of the key indicators of the surface residual stress.

[0068] In the embodiments of the present application, the consistency of the grain size and grain orientation in the main measurement indicators of the surface microstructure should meet the requirements, the grain shape, size and orientation should have relative consistency, and corresponding provisions can also be made according to actual requirements.

[0069] In the embodiments of the present application, the depth t变质层 (x) should be less than or equal to the material removal thickness of the subsequent superfinishing process, generally 2-3 μm, referred to as acceptable ground metamorphic layer. The metamorphic layer depth t(x) can be determined according to the bearing inner ring diameter d, bearing inner ring wall thickness h, bearing working accuracy a w , and wear resistance w, etc. requirements, i.e. according to the actual application requirements, the limiting criteria or limit value T is specified 变质层 , as shown in equation (1);

[0070] t 变质层 (x) = f(d, h, a w , w,...) ≤ T 变质层 (1)

[0071] In the embodiments of the present application, the surface microcrack metric indicators mainly include microcrack width (B) and length (L), and the microcrack should be avoided to be perpendicular to the rolling direction of the raceway, the angle between the microcrack and the tangential direction of the raceway is α, and B, L, α should be as small as possible or tend to 0. The limiting criteria or limit value can be determined according to the actual application requirements, as shown in equation (2). Wherein, B, L, α should be as small as possible or tend to 0, when the microcrack width or length is greater than 10 μm, surface defects such as surface spalling or scratches will be formed:

[0072] t(x) 微裂纹 = f(B, L, α) ≤ T 微裂纹 (2)

[0073] In the embodiments of the present application, the limiting criteria and limit value of the key indicators of surface residual stress should be specified, such as the maximum residual compressive stress (σ cmax ), the maximum residual tensile stress (σ tmax ), the extreme value ratio of residual compressive stress and residual tensile stress (ε σ ), the extreme value ratio of the maximum residual stress of the processed surface to the size tolerance T (σ t-c| ), and their limit values, as shown in equations (3), (4), (5);

[0074] σ |t-c| = σ tmax - σ cmax (3)

[0075]

[0076] σ |t-c| ≤ 10% ~ 15% T (5)

[0077] Example 3:

[0078] The method for defining acceptable key indicators of surface integrity in this invention includes key indicators such as acceptable grinding-modified layer thickness, acceptable surface microcrack size, and acceptable surface residual stress, as well as specific definition criteria and methods that conform to objective conditions.

[0079] In an embodiment of the present invention, the thickness (d) of the grinding modified layer needs to be less than the material removal thickness of the subsequent ultra-precision machining process, approximately 3 μm;

[0080] In embodiments of the present invention, the width (B) and length (L) of the surface microcracks should be as small as possible, and the angle (α) between the microcracks and the circumferential direction of the raceway should be as small as possible or equal to 0, that is, parallel to the circumferential direction of the raceway.

[0081] In embodiments of the present invention, the surface residual stress depth (dc) should be greater than the residual tensile stress depth (dt), and the ratio ε between the two should be greater than ε. d It should conform to the relationship in formula (6):

[0082]

[0083] In an embodiment of the present invention, the maximum residual compressive stress (σ) cmax Absolute value and maximum residual tensile stress (σ) tmax The ratio ε σ The relationship conforms to formula (7):

[0084]

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-speed grinding method for bearing raceways considering surface integrity, characterized in that, The high-speed grinding method for bearing raceways that considers surface integrity employs a grinding wheel linear velocity of no less than 50 m / s, and the bearing raceway linear velocity is matched with the grinding wheel linear velocity. The ratio of the matching bearing raceway linear velocity to the grinding wheel linear velocity is denoted by Ratio. Simultaneously, the grinding depth a is determined. p ; Bearing raceway linear velocity v w It should be related to the linear velocity v of the grinding wheel s Matching, v s With v w The ratio is shown in the formula and is expressed as Ratio; The effective value for Ratio is 30–45; With the goal of controlling key indicators of surface integrity, the maximum undeformed thickness 'a' of the wear debris is used. gmax To unify the variables, we examine different values ​​of a. gmax The achievement of key indicators of surface integrity in grinding under different combinations of process parameters was investigated and evaluated. gmax To investigate the interaction patterns of key surface integrity indicators, and to construct a correlation between key surface integrity indicators and a gmax A correlation model of process parameters and their combinations.

2. The high-speed grinding method for bearing raceways considering surface integrity as described in claim 1, characterized in that, Maximum undeformed thickness of grinding debris a gmax a gmax It is an important evaluation index derived from the combination of multiple process parameters, relatively independent, and based on quantitative analysis and prediction of key indicators of grinding surface integrity, determining a gmax .

3. The high-speed grinding method for bearing raceways considering surface integrity as described in claim 2, characterized in that, The high-speed grinding process parameters for bearing raceways refer to the parameters at the grinding wheel linear velocity v. s The bearing raceway linear velocity v corresponding to the inner ring raceway at speeds of 50, 60, 70, and 80 m / s. w and grinding depth a p To investigate the bearing raceway linear velocity v that should be matched under different grinding wheel linear velocity conditions. w And the grinding depth a under certain ratio conditions of grinding wheel linear velocity and bearing raceway linear velocity. p .

4. The high-speed grinding method for bearing raceways considering surface integrity as described in claim 3, characterized in that, Key indicators of surface integrity include acceptable surface microstructure, acceptable grinding-modified layer thickness, acceptable surface microcrack size, and acceptable key indicators and scales of surface residual stress. The main metrics for surface microstructure include grain size, grain orientation, and the consistency of grain size and grain orientation.

5. The high-speed grinding method for bearing raceways considering surface integrity as described in claim 4, characterized in that, The surface microcrack measurement indicators include the width B, length L, and angle α between the surface microcrack and the circumferential direction of the raceway. Key indicators of surface residual stress include the residual compressive stress σ on the surface and subsurface of the bearing raceway. c The residual tensile stress σ in the subsurface layer, which is far from the surface of the bearing raceway. t Depth d of residual compressive stress c Residual tensile stress depth value d t , as well as the limiting criteria and limit values ​​of key indicators of surface residual stress; The consistency of grain size and grain orientation, which are the main indicators of surface microstructure, should be considered. The grain size should meet the requirements, and the grain shape, size, and orientation should be relatively consistent. Grinding depth of modified layer t 变质层 (x) should be less than or equal to the material removal thickness of the subsequent ultra-finishing process, generally 2-3 μm, which is an acceptable grinding-modified layer; the depth of the modified layer t 变质层 (x) Based on the bearing inner ring diameter d, bearing inner ring wall thickness h, and bearing working accuracy a w Furthermore, the wear resistance w requirement should be appropriately limited, that is, the limiting criteria or limit value T should be specified according to the actual application requirements. 变质层 As shown in formula (1); t 变质层 (x)=f(d,h,a w ,w,……)≤T 变质层 (1)。 6. The high-speed grinding method for bearing raceways considering surface integrity as described in claim 4, characterized in that, The surface microcrack measurement index includes the microcrack width B and length L. The angle between the microcrack and the circumferential tangential direction is α, and B, L, and α should be as small as possible or approach 0. According to the actual application requirements, the limiting criteria or limit values ​​are determined, as shown in formula (2). Among them, B, L, and α should be as small as possible or approach 0. When the microcrack width or length is greater than 10 μm, it will form surface defects such as surface peeling or scratches. t(x) 微裂纹 =f(B,L, α)≤T 微裂纹 (2); The criteria and limit values ​​for key indicators of surface residual stress should be specified, including the maximum residual compressive stress σ. cmax Maximum residual tensile stress σ tmax The extreme values ​​ε of residual compressive stress and residual tensile stress σ The extreme value of residual stress on the machined surface as a percentage of the dimensional tolerance T is σ. |t-c| , and their limiting values, as shown in formulas (3), (4), and (5); s |t-c| =s tmax -s cmax (3) s |t-c| ≤10%~15%T (5).

7. The high-speed grinding method for bearing raceways considering surface integrity as described in claim 4, characterized in that, The thickness d of the ground modified layer is less than the material removal thickness in the subsequent ultra-precision machining process, which is 3μm; The angle α between the width B and length L of the surface microcrack and the circumferential direction of the raceway is less than or equal to 0, and is parallel to the circumferential direction of the raceway. Surface residual stress depth d c It should be greater than the depth of residual tensile stress d t The ratio ε between the two d It should conform to the relationship in formula (6): Maximum residual compressive stress σ cmax Absolute value and maximum residual tensile stress σ tmax The ratio ε σ The relationship conforms to formula (7):

8. A method for processing high-end bearings, characterized in that, The high-end bearing processing method uses the high-speed grinding method for bearing raceways that takes into account surface integrity, as described in any one of claims 1 to 7.

Images